Research Article
Improvement of Physicochemical Characteristics of Monoepoxide Linoleic Acid Ring Opening for Biolubricant Base Oil
Table 5
The main wavelengths in the FTIR functional groups of MEOA and HYOOA.
| | Wavelength of MEOAa | Wavelength of HYOOAb | Functional group |
| | — | 3003 | OH stretching (alcohol) | | 3009 | 3003 | C=C bending vibration (aliphatic) | | 2927, 2856 | 2925, 2855 | C–H stretching vibration (aliphatic) | | — | 1737 | C=O stretching vibration (ester) | | 1711 | 1711 | C=O stretching vibration (carboxylic acid) | | — | 1461 | C–H scissoring and bending for methylene group | | — | 1176, 1117 | C–O stretching vibration (ester) | | 1279, 1262 | 1279 | C–O stretching asymmetric (carboxylic acid) | | 934 | 934 | C–O bending vibration (carboxylic acid) | | 967 | 967 | C–H bending vibration (alkene) | | 820 | — | C–O–C oxirane ring | | 723 | 723 | C–H group vibration (aliphatic) |
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Notes: Monoepoxide linoleic acid (a); 9,12-Hydroxy-10,13-oleioxy-12,9-octadecanoic acid (b).
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